CN-115451898-B - Centering method of geometrical parameter measurement system of rotary body type test piece

CN115451898BCN 115451898 BCN115451898 BCN 115451898BCN-115451898-B

Abstract

The invention discloses a centering method of a rotary type test piece geometric parameter measurement system, which is characterized in that centering operation is carried out on a tested piece or a rotary table through a measuring head, so that centering of the measuring head is completed, the centering method of the measuring head on the tested piece is taken as an example, S01, the tested piece is concentrically arranged on the rotary table, the measuring head is initially arranged, S02, in the rotating process of the rotary table, positions of a free end of the measuring head on the tested piece when the rotary table rotates for one circle at initial positions phi 1 and phi 2 angles are recorded as a, b and c respectively, S03, a rotating shaft end of the measuring head is taken as a fixed reference system origin O, a corresponding position point A, B, C of the tested piece is obtained, S04, a circle center O 'of a triangle formed by A, B, C is obtained, S05, the rotating shaft end is adjusted to the position of the circle center O', and S06, the rotating measuring head is subjected to angle adjustment until the free end of the measuring head is aligned with the rotating center of the tested piece. The invention can realize the rapid and accurate centering of the measuring head.

Inventors

Liu Caitao
CUI YUGUO
LIANG DAN

Assignees

宁波大学
宁波大学

Dates

Publication Date: 20260421
Application Date: 20220926
Priority Date: 20220926

Claims (8)

1. A centering method of a rotary body type test piece geometric parameter measurement system comprises a tested piece (3) concentrically arranged on a rotary table (1), and a measuring head (2) positioned at the side of the tested piece (3), wherein the measuring head (2) comprises a rotating shaft end (22) and a free end (21), the free end (21) is used for measurement, the centering method comprises the following steps of S01, concentrically arranging the tested piece (3) on the rotary table (1) and preliminarily arranging the measuring head (2), S02, recording positions of the free end (21) of the measuring head (2) on the tested piece (3) when the rotary table (1) rotates for one circle at initial positions, 1 and 2 angles in the rotating process of the rotary table (1), respectively, namely a first measuring point a, a second measuring point b and a third measuring point c, S03, taking the rotating shaft end (22) of the measuring head (2) as a fixed reference system origin O, obtaining a position point A, B, C of the corresponding tested piece (3), S04, obtaining a triangular position O05 formed by three points of the measuring head (A, B, C), and completing centering adjustment of the measuring head (2) until the rotating coordinates of the measuring head (2) are aligned with the center of the rotary table (2) of the rotary table (1) to the center of rotation coordinates (2).
2. The centering method of the system for measuring geometric parameters of a rotating body type test piece according to claim 1, wherein in the step S04, the position of the circle center O is obtained by taking the intersection point of the perpendicular bisectors of the AB line segment and the BC line segment as the circle center O.
3. The centering method of the rotary body type test piece geometric parameter measurement system according to claim 2, wherein in the step S06, the direction centering of the test head (2) is realized by rotating the test head (2) by a certain angle and recording measurement data in the process to obtain the shortest distance position between the test head (2) and the tested piece (3).
4. A centering method of a geometrical parameter measuring system of a rotating body type test piece according to any one of claims 1 to 3, wherein the coordinates of the three points a, b and c and the coordinates of the three points A, B, C have the same numerical value.
5. A centering method of a rotary type test piece geometric parameter measuring system comprises the steps of recording a rotary table (1) with a standard cylinder outer contour, measuring heads (2) located on the side of the rotary table (1), wherein each measuring head (2) comprises a rotating shaft end (22) and a free end (21), the free ends (21) are used for measuring, S01 is arranged in a preliminary mode, the measuring heads (2) are aligned to the rotary table (1), S02 is used for recording the positions of the free ends (21) of the measuring heads (2) on the rotary table (1) when the rotary table (1) rotates for a circle in an initial position and at angles of 1 and 2 are respectively a first measuring point a, a second measuring point b and a third measuring point c, S03 is used for obtaining a position point A, B, C of a corresponding rotary table (1) by taking the rotating shaft end (22) of the measuring head (2) as a fixed reference system origin, S04 is used for obtaining the position of a circle center O of an circumscribed circle formed by three points A, B, C of the measuring heads, S05 is used for adjusting the positions of coordinates of the ends (22) to the circle center O, S06 is used for adjusting the positions of the measuring heads, and S2 is used for adjusting the positions of the measuring heads (2) on the rotary table (1) along the axis (1) when the rotary table (2) is rotated for adjusting the rotary table (2) to be aligned to the center (2) to the rotary table (1), and the test piece (2) is adjusted to be aligned to the axial direction (1).
6. The centering method of the system for measuring geometric parameters of a body type test piece according to claim 5, wherein in the step S04, the position of the center O is obtained by taking the intersection point of the perpendicular bisectors of the AB and BC line segments as the center O.
7. The method for centering a geometric parameter measurement system of a rotating body type test piece according to claim 6, wherein in the step S06, the direction centering of the test head (2) is realized by rotating the test head (2) by a certain angle and recording measurement data in the process to obtain the shortest distance between the test head (2) and the turntable (1).
8. The method for centering a geometrical parameter measurement system of a rotating body type test piece according to any one of claims 5 to 7, wherein the coordinates of the three points a, b and c and the coordinates of the three points A, B, C have the same numerical value.

Description

Centering method of geometrical parameter measurement system of rotary body type test piece Technical Field The invention belongs to the technical field of precise measurement, and particularly relates to a centering method of a geometrical parameter measurement system of a rotating body type test piece. Background The rotary type test piece is an important component in precision instruments, such as a flexspline, a rigid spline, a gear in an RV reducer and the like, and is a typical rotary type test piece. In order to ensure the performance requirements of the rotary body type test piece, the machining quality of the rotary body type test piece needs to be ensured by a precise measuring means. For geometric parameters of a rotary body type test piece, such as tooth form, bar span and radial deformation of a flexible gear in a harmonic reducer, a single tooth pitch deviation, accumulated tooth pitch deviation, radial runout and the like of a cycloid gear in an RV reducer are measured by adopting a rotary table rotary measurement method. The measuring head for measuring the rotary body type test piece comprises a laser measuring head and a mechanical measuring head. In the patent application with Chinese publication number CN109540032A and the name of a non-contact laser detection revolution body section profile shape error device, a non-contact laser detection revolution body section profile shape error device is disclosed, and mainly comprises a vertical lifting table, a horizontal sliding table, a sliding table mounting plate, a precise rotating table, a laser displacement sensor, an encoder and various connecting pieces. The laser displacement sensor is positioned in the optimal range by adjusting the position of the sliding table mounting plate, the angle of the laser displacement sensor is adjusted according to the optical reflection condition of the surface of the workpiece to be measured, the position of the section to be measured of the workpiece to be measured is adjusted by controlling the vertical lifting table through a computer, and the horizontal position of the laser displacement sensor is adjusted by controlling the precise sliding table through the computer. The data acquired by the sensor are transmitted to a computer through the acquisition card, and the data are processed, so that the roughness, the waviness and the shape error of the section profile of the workpiece to be measured are obtained. In the patent application with the Chinese publication number of CN114812480A and the name of a precise measuring device for the appearance characteristics of the outer surface of a large-caliber workpiece, the precise measuring device for the appearance characteristics of the outer surface of the large-caliber workpiece also belongs to the field of precise measurement of rotary workpieces and consists of a power assembly, an encoder assembly, a supporting assembly, a workpiece clamping assembly, a sensor assembly and a bottom plate. The power assembly is fixedly connected to the left front of the bottom plate, the encoder assembly is fixedly connected to the middle of the left side of the bottom plate, the supporting assembly is fixedly connected to the middle of the bottom plate, the workpiece clamping assembly is fixedly connected with the supporting assembly through a key, and the sensor assembly is fixedly connected to the right rear of the bottom plate. It can be seen from the drawings of the specification that the head of the measuring head is fixed by bolts respectively, so that the measuring head can move up and down and rotate around one of the bolts. In the process of measuring the geometric parameters of the rotary body type test piece, when the measuring head is installed, deviation exists in the installation position, and corresponding distortion occurs in the measurement result, so that the centering operation of the measuring head is required after the measuring head is installed. The traditional centering mode is realized by repeatedly and continuously adjusting the angle of the measuring head or adjusting the space position of a tested piece through the experience of an operator, and the difficulty is that the position of the rotating shaft end of the measuring head is adjusted, and then the angle of the measuring head is adjusted. Disclosure of Invention The invention aims to solve the technical problem of a centering method of a geometrical parameter measuring system of a rotary body type test piece, which aims to realize the rapid and accurate centering of a measuring head when the geometrical parameter is measured after the rotary body type test piece is processed in the precision processing production process. The technical scheme adopted by the invention for solving the technical problems is that the centering method of the geometrical parameter measuring system of the rotary type test piece comprises a tested piece concentrically arranged on a rotary table, a measuring he